I know I'm resurrecting an old thread but just thought I'd share with the group that asked this question: I hbn coat everything that my savage .300 win mag eats. Most recently i worked up a scorching hot load and successfully took two deer, an antlerless mule and a whitetail buck, with said load.
HBN coated 120 grain Barnes tac tx on top of 89.5 grains of hodgdon superformance in Peterson brass, 215m ignition. DO NOT JUST GO AND TRY DUPLICATING THIS! I did careful work up meticulously. This is yielding 4050 fps muzzle velocity, just about 4400 foot pounds. It's almost certainly quite overpressure at peak, but the cases just lazily dribble out and the primers aren't cratering at all. No issues. I doubt i would have got them rockin this fast with no issues without the hbn initial pressure spike reduction. I love HBN!
My application method is perhaps unorthodox but it was born of needing to use only things I already had when I started using hbn a few years ago. I had literally no extra money at the time to buy anything extra besides the powder itself. I cut open a bunch of steel waterfowl shotgun shells I had laying around, number 2 shot I think, doesn't matter. I washed the bbs in soap and water to degrease them and then I let them dry. This is my media haha. I put these bbs in a small jar with hbn powder and put them in the vibratory tumbler I have (no rotary yet). I then took them out, put them on a cookie sheet, and baked them at 200f or so for a while before tumbling again, figuring the heat would open up any pores in the metal to let the hbn impregnate it more readily.
I still have those bbs. Haven't needed to change a thing. I now do the same thing with my bullets and it works just fine. I put them in a jar with my treated bbs, a bit of powder, and tumble them a while, before taking them out and baking them in an oven at 200 f or so for an hour or so, then tumble them again. Sometimes I take them out of the jar at the end and really let them fly around in the vibratory tumbler.
No problems so far.